MacPeak Systems, Spyglass, Austin, Texas originally sold these cards for the SE as Orion accelerators (from about 1988 onwards). They were about $800. They then discontinued (or renamed) the Orion and sold the next version as the Irwin accelerator. Owners of the Orion could upgrade to the Irwin relatively cheaply for about $300. I suspect both the Orion and the Irwin had associated (but distinct) utilities diskettes (3.5" 800K). I definitely still have the Irwin utilities disk, but I am not sure about whether I still have the Orion utilities disk. I also think I have the Irwin utilities programme file (something like a Control Panel device ?) on a Mac CD-ROM I had made (at some expense, by a bureau, back in about 1999). All that gear is in Australia, and I am in Denmark, but I should return to Australia in mid-November - if you want to follow this up.
...
Donald